使用动力吸振器降低轴系纵振引起的水下结构辐射噪声研究

以带有推进轴系的单层锥柱结合壳体为研究对象,用FEM/BEM方法计算轴系纵振激励导致的结构水下振动与声辐射响应.为了降低结构水下辐射噪声,在推进轴系上安装动力吸振器,分析了动力吸振器质量、阻尼和个数对水下结构辐射噪声特性的影响.数值计算结果表明,动力吸振器的减振效果具有较强的频率选择性,吸振频率相同的条件下,可以通过增加动力吸振器的质量、阻尼和吸振器的个数来改善水下结构的辐射噪声.

Using dynamic absorbers to reduce underwater structural noise due to longitudinal vibration of shafting

The vibration and radiation induced by longitudinal vibration of shafting of underwater structures was evaluated by using FEM/BEM with the typical structure a single-level cone with shell attached. Dynamic absorbers were installed on the shafting in order to reduce the noise radiated by the underwater structure. The effects of structural parameters, such as mass, damping, and the number of absorbers on the vibration and acoustic radiation of underwater structures were discussed. Simulation results show that the effect of vibration absorption mainly depends on the frequency involved. At the same working frequency, better vibration absorption and lower radiated noise can be achieved by increasing mass, damping, and the number of dynamic vibration absorbers.